Exceed for Running Catia V4 on AIX box from a PC

I'm a CAD user, mostly using CATIA V4 on a RISC6000 AIX workstation. Now I'm using Catia V5 on a PC, and my AIX box is gone, sadly. When I need to do something on an old V4 file, I have to log into V4 on someone elses AIX box using Exceed from my PC. This is a terribly slow way to work, and especially the graphics is poor. I'd imagine this is because the PC is acting as a dumb terminal and everything is coming from the AIX box over the network. As powerful as PCs are now (far more so than the workstations) this seems a poor approach. I mean, I wonder why no one's created a way to carry more of the work of running V4 on the PC's CPU and video card, thus getting usable performance without having to have each person have two complete sets of hardware. Probably the answer has to do with software license cost, but the situation is very poor for the user.

Any solutions to help the situation out there? Can a PC better emulate an AIX box in some way to get around this?

This is that 3D acceleration is still impossible over network, this means that there is no good 3D hardware to work over network. Other speedy X-servers for windows are from microimages or netsarang, but none works 3D over network.
All rendering is done by CATIA software on AIX box and passed to your dsplay in plain picture format, so only fast computer to run CATIA and fast network (TR or 10Mbpsare slow for that matter) to your display can help a bi, but not a lot.
AIX ML packages are known to optimize some aspects of AIX software for that matter too.

It would be nice if there were such a thing as maybe a version of V4 ported to run on a PC, or if the Unix OS would just run on the PC. I'm not sure what the differences are in the hardware of a Unix WS. Probably different enough to make that an impossible wish.

We have a lot of Unix boxes, yet they're very scarce. Since we're moving toward the PC with the newer software like Catia V5, so we don't buy Unix boxes anymore. But we have a great deal of old work in the Unix world, so you can't escape the need for a WS.

Linux can run on a PC, is there not something close enough to AIX that CATIA V4 might run on it on the PC?

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